Respiratory function monitoring using a real-time three-dimensional fiber-optic shaping sensing scheme based upon fiber Bragg gratings

Abstract. An array of in-line curvature sensors on a garment is used to monitor the thoracic and abdominal movements of a human during respiration. The results are used to obtain volumetric changes of the human torso in agreement with a spirometer used simultaneously at the mouth. The array of 40 in-line fiber Bragg gratings is used to produce 20 curvature sensors at different locations, each sensor consisting of two fiber Bragg gratings. The 20 curvature sensors and adjoining fiber are encapsulated into a low-temperature-cured synthetic silicone. The sensors are wavelength interrogated by a commercially available system from Moog Insensys, and the wavelength changes are calibrated to recover curvature. A three-dimensional algorithm is used to generate shape changes during respiration that allow the measurement of absolute volume changes at various sections of the torso. It is shown that the sensing scheme yields a volumetric error of 6%. Comparing the volume data obtained from the spirometer with the volume estimated with the synchronous data from the shape-sensing array yielded a correlation value 0.86 with a Pearson’s correlation coefficient p<0.01.

[1]  K. Ebi,et al.  Tidal volume and respiratory timing derived from a portable ventilation monitor. , 2002, Chest.

[2]  S. Loring,et al.  A simple and reliable method to calibrate respiratory magnetometers and Respitrace. , 1995, Journal of applied physiology.

[3]  Jinsong Leng,et al.  Structural shape sensing for variable camber wing using FBG sensors , 2009, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[4]  David J. Webb,et al.  The application of a long period grating sensors to human respiratory plethysmography , 2007, European Conference on Biomedical Optics.

[5]  Ralph P. Tatam,et al.  Bend sensing in structures using long-period optical fiber gratings , 2000, Symposium on Applied Photonics.

[6]  Libo Yuan,et al.  Three-core fiber-based shape-sensing application. , 2008, Optics letters.

[7]  S. J. Cala,et al.  Chest wall and lung volume estimation by optical reflectance motion analysis. , 1996, Journal of applied physiology.

[8]  Alan D. Kersey,et al.  Shape and vibration mode sensing using a fiber optic Bragg grating array , 1996 .

[9]  L T D'Angelo,et al.  A system for respiratory motion detection using optical fibers embedded into textiles , 2008, 2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[10]  J. Mead,et al.  Measurement of the separate volume changes of rib cage and abdomen during breathing. , 1967, Journal of applied physiology.

[11]  J. Riordan,et al.  Identification of the Cystic Fibrosis Gene : Chromosome Walking and Jumping Author ( s ) : , 2008 .

[12]  Hypolito José Kalinowski,et al.  A fibre optic Bragg grating strain sensor for monitoring ventilatory movements , 2001 .

[13]  K. Bloch,et al.  Monitoring of ventilation during exercise by a portable respiratory inductive plethysmograph. , 2005, Chest.

[14]  I. Bennion,et al.  Resonant cavity time-division-multiplexed fiber Bragg grating sensor interrogator , 2004, IEEE Photonics Technology Letters.

[15]  J Stocks,et al.  Measurement of lung volumes by plethysmography. , 1997, The European respiratory journal.

[16]  J. C. Smith,et al.  Three degree of freedom description of movement of the human chest wall. , 1986, Journal of applied physiology.

[17]  K. Krebber,et al.  Medical Textiles With Embedded Fiber Optic Sensors for Monitoring of Respiratory Movement , 2012, IEEE Sensors Journal.

[18]  S Levine,et al.  Use of a triaxial magnetometer for respiratory measurements. , 1991, Journal of applied physiology.

[19]  B Jones,et al.  Chest and abdominal surface motion measurement for continuous monitoring of respiratory function , 2001, Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine.

[20]  A Pedotti,et al.  Optoelectronic plethysmography in intensive care patients. , 2000, American journal of respiratory and critical care medicine.

[21]  D. Caleb Rucker,et al.  Visual sensing of continuum robot shape using self-organizing maps , 2010, 2010 IEEE International Conference on Robotics and Automation.

[22]  T Allsop,et al.  Arbitrary real-time three-dimensional corporal object sensing and reconstruction scheme. , 2012, Optics letters.

[23]  Tamara B Harris,et al.  Comparisons of percentage body fat, body mass index, waist circumference, and waist-stature ratio in adults. , 2009, The American journal of clinical nutrition.

[24]  G. Skrepnek,et al.  Epidemiology, clinical and economic burden, and natural history of chronic obstructive pulmonary disease and asthma. , 2004, The American journal of managed care.

[25]  Ian Bennion,et al.  Embedded progressive-three-layered fiber long-period gratings for respiratory monitoring. , 2003, Journal of biomedical optics.

[26]  Heather Patrick Self-aligning bipolar bend transducer based on long period grating written in eccentric core fibre , 2000 .

[27]  Lee A. Danisch,et al.  Spatially continuous six degree of freedom position and orientation sensor , 1999 .

[28]  Stephen T. Kreger,et al.  High-accuracy fiber-optic shape sensing , 2007, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.